13402820 has 24 divisors (see below), whose sum is σ = 28413504. Its totient is φ = 5310176.

The previous prime is 13402793. The next prime is 13402841. The reversal of 13402820 is 2820431.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13402792 and 13402801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (1183896).

Almost surely, 2^13402820 is an apocalyptic number.

13402820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13402820 is an abundant number, since it is smaller than the sum of its proper divisors (15010684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13402820 is a wasteful number, since it uses less digits than its factorization.

13402820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6379 (or 6377 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 13402820 is about 3660.9862059287. The cubic root of 13402820 is about 237.5374345425.

The spelling of 13402820 in words is "thirteen million, four hundred two thousand, eight hundred twenty".